So yeah long story short my wife actually feels unsafe driving the Nitro because of how "easy/over sensitive" the steering is. Since day one I've always thought the power steering pump was just a strong unit made with jeep owners and their oversized tires in mind.

But it is a problem when my wife is not comfortable driving around with my kids because she feels that the steering is effected by every little imperfection in the road. An I agree with her tbh but I've become use to it after almost 8 years of ownership.

Is there any possible way to make the steering stiffer/ less sensitive?

We do need more info. Bump steer, over steer, loose steering(drift)?
Could need to put some stiffer side walled tires on it, or maybe the opposite and need to air down a bit.
I noticed the steering got harder to turn after my lift. (before my bigger tires) Just sayen...

It's like the power steering pump is too powerful. It's always been this way so it's not a mechanical issue or anything that went bad. It just moves with the slightest of input whether that be from the road or a finger. No feedback.

Can the pump pressure be adjusted? I can't really explain it any other way. The steering is just to light. The fiesta has more "sure footed" on the road then a 4x4 SUV

Sounds almost like your caster is not right.
Honestly I don't remember before my lift how it handled.
I am not aware if a way to "calibrate" the P/S pump. They are set at the factory.
I did find some reference to bubbles in the system causing a bump steer effect.
Only other option would be to have the flow rate and pressure tested to see if it is within specs.

I have similar impression. Force needed to rotate the steering wheel is very low. Good for parking, imprecise at hwy speed. Previous car had progressive steering boost. Less and less boost at higher speeds.

The feeling is multiplied by Nitro's suspension and height. Unfortunately I don't think it can be adjusted.